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Nice to see you on the community forums @Kokobou! Thank you for sharing what is happening to your Blaze's display. Seen that it's been some time since your question, if the problem still persists, I recommend you to clean the charging contacts and put your tracker to charge for two hours and then try restarting it.
Also I wanted to know that I moved your post to the English Community forum as you wrote on that language, but if you need any help in French you can let me know 🙂
Hope this helps!